The Belkin Pro Serial Port Extension Cable is a high-quality cable designed for extending the reach of a serial port connection by 6 feet. With a 9-pin male connector on one end and a 9-pin female connector on the other, this cable allows for easy connection and extension of serial signals. The durable construction and reliable performance make it a dependable choice for various vintage computer networking and connectivity needs. The cable jacket has a URL on it, so my guess is this cable dates to the early 2000s.